title: Effects of nonmagnetic interparticle forces on magnetorheological fluids.
abstract: Effects of nonmagnetic interparticle forces on the on- and off-state behavior of magnetorheological fluids are investigated experimentally and with particle-level simulations. Suspensions of iron particles in an aliphatic oil are modified by surface-active species. The modifications significantly alter the off-state properties, but have little impact on the field-induced stresses. Simulations show similar behavior. Off-state rheological properties are strongly influenced by van der Waals forces and modifications of the short-range repulsive forces. Field-induced stresses are less sensitive to the nonmagnetic forces.
authors.affiliation: Chemical and Biological Engineering Department and Rheology Research Center, University of Wisconsin, Madison, WI 53706, USA. klingen@engr.wisc.edu
authors.forename: D J
authors.initials: DJ
authors.lastname: Klingenberg
authors.forename: C H
authors.initials: CH
authors.lastname: Olk
authors.forename: M A
authors.initials: MA
authors.lastname: Golden
authors.forename: J C
authors.initials: JC
authors.lastname: Ulicny